JP2016024935A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a power storage device capable of preventing electric leakage.SOLUTION: A power storage cell 3 includes: a power storage body 5 storing electric charges; a cell case 6 housing the power storage body 5; and an electrode tab 9 introducing a current to the power storage body 5. A power storage device 1 includes: a cell frame body 10 connected to the cell case 6; and a heat transfer body 20 provided between the cell case 6 and the cell frame body 10 and transferring heat of the power storage cell 3 to the outside of the cell case 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power storage device that is charged and discharged.

  Patent Document 1 discloses a laminated battery pack in which a plurality of laminated batteries are stacked and accommodated in a case.

  The laminated battery pack has a cooling air passage formed in the case, and the cooling air taken from the outside is guided to the electrode tab of the laminated battery.

JP 2008-282545 A

  However, in such a conventional power storage device, since the cooling air is guided to the electrode tab, if dust or the like contained in the cooling air adheres to the electrode tab, there is a risk of causing electric leakage at the time of condensation.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a cooling structure for a power storage device that can prevent electric leakage.

  According to an aspect of the present invention, a power storage device that charges and discharges a power storage cell, wherein the power storage cell guides a current to the power storage body, a cell case that houses the power storage body, and the power storage body. An electrode tab, and a cell frame that is coupled to the cell case, and a heat transfer member that is provided between the cell case and the cell frame and transmits heat of the storage cell to the outside of the cell case. A power storage device is provided.

  According to the above aspect, the heat generated in the electricity storage body is released from the cell case to the outside of the cell case through the heat transfer body. Thereby, it becomes possible to cool an electrical storage body, without exposing an electrode tab to external air, and it can prevent that dust etc. accumulate on an electrode tab and raise | generates an electric leakage.

It is a perspective view which shows the cooling structure of the electrical storage cell which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the II-II line of FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a perspective view which shows an electrical storage apparatus. It is a perspective view which shows the electrical storage apparatus which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a perspective view showing a cooling structure of the storage cell 3. The power storage device 1 includes a plurality of power storage cells 3.

  First, the configuration of the storage cell 3 will be described. The storage cell 3 is a secondary battery that is charged and discharged by a chemical reaction, and a lithium ion battery is used. The storage cell 3 is not limited to this, and may be another battery. Moreover, the electrical storage cell 3 may be a capacitor (capacitor) that stores electric charges by electrostatic capacity.

  FIG. 2 is a cross-sectional view of the storage cell 3 taken along line II-II in FIG. The power storage cell 3 includes a power storage unit 5 that stores electric charge and a bag-like cell case 6 that houses the power storage unit 5.

  The power storage unit 5 is formed by laminating a plurality of positive electrode bodies and negative electrode bodies, and is housed in the cell case 6 together with the electrolytic solution.

  The laminate material used as the material of the cell case 6 has a multilayer structure of three or more layers of a metal foil (aluminum foil) intermediate layer and a resin surface layer sandwiching the intermediate layer.

  The cell case 6 has a rectangular bag-shaped bag portion 7 that houses the power storage unit 5 and the electrolytic solution, and an end portion 8 in which the end portions of the laminate material are bonded together. The end portion 8 is formed by bonding the end portions of the laminate material by welding, and protrudes from the periphery of the bag portion 7 in a flange shape.

  A pair of electrode tabs 9 extend from the left and right ends of the power storage unit 5. The base end portion of one electrode tab 9 (positive electrode terminal) is connected to the positive electrode body of the power storage unit 5. The base end portion of the other electrode tab 9 (negative electrode terminal) is connected to the negative electrode body of the power storage unit 5. The tip of each electrode tab 9 protrudes from the end 8 of the cell case 6 to the outside of the cell case 6 and is connected to a power supply circuit (not shown). The storage cell 3 is charged and discharged via each electrode tab 9 by the operation of the power supply circuit.

  In the power storage device 1, a plurality of power storage cells 3 are stacked via a cell frame 10. A pair of cell frame bodies 10 are provided on both sides of the storage cell 3 in the stacking direction of the storage cells 3.

  The cell frame 10 is formed in a rectangular frame shape so as to surround the bag portion 7 of the cell case 6. The cell frame 10 includes a left side portion 11 formed along the left side of the end portion 8 of the cell case 6, a right side portion 12 formed along the right side of the end portion 8 of the cell case 6, It has an upper side portion 13 formed along the upper side of the end portion 8 and a lower side portion 14 formed along the lower side of the end portion 8 of the cell case 6.

  In the stacking direction of the storage cells 3, the thickness of the left side portion 11 and the right side portion 12 is formed to be larger than the thickness of the upper side portion 13 and the lower side portion 14. One convex portion 13A is formed on the upper side portion 13 of the thin plate shape. Similarly, two convex portions 14A are formed on the lower side portion 14 of the thin plate shape. The convex portions 13 </ b> A and the convex portions 14 </ b> A have the same thickness as the left side portion 11 and the right side portion 12 in the stacking direction of the storage cells 3. In the state where the storage cells 3 are stacked, the left side portions 11, the right side portions 12, the convex portions 13 </ b> A, and the convex portions 14 </ b> A of the adjacent cell frame bodies 10 are in contact with each other.

  Case holes 18 are formed at the four corners of the end 8 of the cell case 6. Frame holes 15 are formed at the four corners of the cell frame 10, and cylindrical spacers 16 are inserted into the frame holes 15. The plurality of power storage cells 3 and the cell frame 10 are fastened via four bolts 19 inserted into the case holes 18 and the spacers 16 in a state of being stacked on each other (see FIG. 5). Thereby, the electrical storage cell 3 is hold | maintained because the edge part 8 of the cell case 6 is pinched | interposed between a pair of cell frame 10. FIG.

  The power storage device 1 has a cooling structure for cooling each power storage cell 3. Hereinafter, the cooling structure of the storage cell 3 will be described.

  The power storage device 1 includes a heat transfer body 20 between the end 8 of the cell case 6 and the cell frame 10. The heat transfer body 20 is made of a gel (GEL) having higher thermal conductivity than the cell frame 10, and for example, an acrylic resin is used.

  The heat transfer body 20 is formed in layers by being applied to the surface of the cell frame 10. Thus, the frame assembly 17 in which the cell frame 10 and the heat transfer body 20 are integrated is provided.

  In the power storage device 1, a pair of frame assemblies 17 are coupled to both sides of the cell case 6. The cell frame 10 and the cell case 6 are joined by ultrasonic bonding. However, the present invention is not limited to this, and both may be coupled by laser welding. Moreover, you may couple | bond both through an adhesive agent. Further, both may be coupled by fastening the bolt 19.

  By combining the cell case 6 and the cell frame 10, it is possible to prevent the cell case 6 from being displaced from the cell frame 10. Thereby, it is prevented that the surface layer of the resin of the laminate material is worn, and the insulation of the cell case 6 is maintained.

  The heat transfer body 20 is in close contact with the end portion 8 of the cell case 6 while being sandwiched between the cell frame 10 and the end portion 8 of the cell case 6.

  3 is a cross-sectional view of the left side portion 11 of the cell frame 10 and the heat transfer body 20 along the line III-III in FIG. FIG. 4 is a cross-sectional view of the lower side portion 14 and the heat transfer body 20 along the line IV-IV in FIG. The heat transfer body 20 includes a heat absorbing portion 21 that contacts the end portion 8 of the cell case 6 and a heat radiating portion 22 that faces the outside of the cell case 6. The heat absorbing portion 21 and the heat radiating portion 22 are formed to be connected to each other.

  The cell frame 10 has a rectangular facing surface 10 </ b> A that faces the end 8 of the cell case 6. The heat absorbing portion 21 of the heat transfer body 20 is formed along the facing surface 10 </ b> A of the cell frame 10.

  As shown in FIG. 2, the electrode tab 9 has a through portion 9 </ b> A that penetrates the end portion 8 of the cell case 6. The heat absorbing portion 21 of the heat transfer body 20 includes an electrode tab heat absorbing portion 21 </ b> A that faces the through portion 9 </ b> A of the electrode tab 9 via the end portion 8 of the cell case 6. The electrode tab heat absorption part 21 </ b> A is formed as a part of the heat absorption part 21.

    The heat radiating portion 22 is formed along a non-facing surface (lower surface) 10 </ b> B that does not face the end portion 8 of the cell case 6 of the cell frame 10, and faces the outside of the cell case 6. A heat radiator 30 shown in FIG. 5 is in contact with the heat radiating portion 22.

  FIG. 5 is a perspective view showing the power storage device 1. The power storage device 1 includes a power storage module 2 including a plurality of power storage cells 3 and a radiator 30 that promotes heat dissipation of the power storage module 2.

  In the power storage module 2, a plurality of power storage cells 3 are stacked via a cell frame 10 between a pair of plates 25 and 26 provided at both ends, and fastened via four bolts 19 penetrating through the corners. Is done. Each storage cell 3 is pressed against each other in the stacking direction by the tensile force of each bolt 19.

  The heat radiation part 22 of each heat transfer body 20 is exposed on the lower surface of the power storage module 2, and the radiator 30 is attached so as to be in contact with the heat radiation part 22.

  The heat radiator 30 includes a heat sink portion 31 that contacts the heat radiating portion 22 of the heat transfer body 20 and a plurality of heat radiating fin portions 32 that protrude from the heat sink portion 31. The heat sink portion 31 is formed in a rectangular flat plate shape that extends along the lower surface of the power storage module 2. The radiating fin portion 32 is formed in a rib shape that protrudes downward from the heat sink portion 31 and extends linearly. The radiator 30 is made of a metal plate having a high thermal conductivity such as an aluminum material or a copper material.

  The radiating fin portion 32 is not limited to the configuration described above, and a corrugated fin obtained by bending a metal plate into a wave shape may be used. Moreover, you may use the slit fin which formed the notch | incision in the metal plate for the radiation fin part 32. FIG. Further, the heat radiating fin portion 32 may be an offset fin in which a metal plate is bent into a wave shape and the waved portions are arranged offset from each other.

  The power storage device 1 includes a blower fan (not shown) that blows air to the radiator 30. In the power storage device 1, the air blown by the blower fan hits the radiating fin portion 32 as indicated by an arrow in FIG. 5.

  Note that the power storage device 1 mounted on the vehicle is not limited to the configuration described above, and the traveling wind of the vehicle may hit the radiating fin portion 32.

  In the power storage device 1, each power storage cell 3 is charged and discharged by the operation of the power supply circuit. Along with this, the heat generated in the power storage unit 5 and the electrode tab 9 is absorbed from the end 8 of the cell case 6 to the heat absorption unit 21 of the heat transfer body 20. In the heat transfer body 20, the heat transferred from the heat absorbing portion 21 to the heat radiating portion 22 is released from the heat radiating portion 22 to the heat sink portion 31 of the radiator 30. In the radiator 30, the heat transmitted from the heat sink portion 31 to the radiating fin portion 32 is released to the outside air guided to the radiating fin portion 32.

  In addition, the electrical storage apparatus 1 is good also as a structure by which external air is guide | induced to the thermal radiation part 22 of the heat exchanger 20, without providing the heat radiator 30. FIG. In that case, in the heat transfer body 20, the heat of the heat absorbing portion 21 is released from the heat radiating portion 22 to the outside air.

  Next, the function and effect of the first embodiment will be described.

  According to this embodiment, the cooling structure of the electrical storage cell 3 provided with the heat-transfer body 20 between the cell case 6 and the cell frame 10 is provided. Heat generated in the power storage body 5 is released from the cell case 6 to the outside of the cell case 6 through the heat transfer body 20. As a result, it is possible to cool the power storage unit 5 without exposing the electrode tab 9 to the outside air, and it is possible to prevent electrical leakage due to accumulation of dust or the like on the electrode tab 9. Furthermore, since the storage cell 3 is effectively cooled via the heat transfer body 20, the storage cell 3 is prevented from being overheated, and the durability of the storage cell 3 is enhanced.

  The heat transfer body 20 includes a heat absorbing portion 21 that contacts the cell case 6 and a heat radiating portion 22 that faces the outside of the cell case 6. The heat generated in the storage cell 3 is absorbed from the cell case 6 to the heat absorbing portion 21, and the heat of the heat absorbing portion 21 is released from the heat radiating portion 22 to the outside of the cell case 6. In this way, since the heat radiation of the storage cell 3 is effectively performed through the heat radiating portion 22, the heat radiating portion 22 is provided only on one side (lower surface side) of the heat transfer body 20, and the power storage device 1 can be downsized.

  In addition, not only the structure mentioned above but the heat radiating part 22 of the heat transfer body 20 may be provided on both sides (upper surface side and lower surface side) of the heat transfer body 20 so as to promote heat dissipation of the storage cell 3.

  Further, the heat absorption part 21 has an electrode tab heat absorption part 21 </ b> A that faces the electrode tab 9 through the cell case 6. Heat generated in the power storage unit 5 and the electrode tab 9 is absorbed from the electrode tab 9 through the cell case 6 to the electrode tab heat absorbing portion 21A, and the storage cell 3 is effectively cooled.

  Further, the heat transfer body 20 is formed in layers along the surface of the cell frame 10, and a frame body assembly 17 is provided in which the heat transfer body 20 and the cell frame 10 are integrated. By coupling the frame body assembly 17 to the cell case 6, the heat transfer body 20 can be accurately arranged along the end portion 8 of the cell case 6. Thereby, compared with the case where the heat transfer body 20 is formed in layers along the surface of the cell case 6, the amount of the heat transfer body 20 used can be reduced and the cost of the product can be reduced.

  Moreover, according to this embodiment, the cooling structure of the electrical storage module 2 provided with the heat radiator 30 which contacts the heat transfer body 20 and releases the heat of the heat transfer body 20 to outside air is provided. The heat generated in the power storage module 2 is released from the radiator 30 through the heat transfer body 20 to the outside air, and the power storage module 2 is effectively cooled.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the electrical storage apparatus of the said 1st Embodiment, and description is abbreviate | omitted.

  The power storage device 1 according to the first embodiment includes a radiator 30 that releases heat of the power storage module 2 to the outside air. On the other hand, the power storage device 100 according to the second embodiment includes a heat exchanger 40 that releases heat of the power storage module 2 to a medium circulating in a cooling circuit (not shown).

  The cooling circuit includes a cooling pump (not shown) that sends the medium, a radiator (not shown) that releases the heat of the medium to the outside air, and a heat exchanger 40 that is attached to the power storage module 2.

  The heat exchanger 40 includes a cylindrical tank 41 (inlet pipe) into which a medium flows, a heat exchange part 42 (water jacket) through which the medium guided from the tank 41 circulates, and heat exchange as shown by arrows in FIG. And a tank 43 (exit pipe) for allowing the medium that has exited from the section 42 to flow out as indicated by an arrow in FIG.

  The heat exchanger 40 is provided so that the heat exchange part 42 contacts the heat radiating part 22 of each heat transfer body 20 facing the lower surface of the power storage module 2. Heat exchange is performed between the medium circulating in the heat exchange part 42 of the heat exchanger 40 and the heat radiating part 22 of each heat transfer body 20.

  Although cooling water is used as a medium, it is not restricted to this, You may use another fluid as a medium. Moreover, it is good also as a structure by which the gas which circulates through the air conditioner of a vehicle is guide | induced to the heat exchanger 40. FIG.

  Alternatively, a configuration may be adopted in which a high-temperature medium is circulated in the heat exchanger 40 according to the operating state of the power storage device 100 and the power storage module 2 is quickly heated by heat dissipation of the medium.

  According to this embodiment, the temperature adjustment structure of the electrical storage module 2 provided with the heat exchanger 40 which circulates the medium which heat-exchanges with the heat exchanger 20 is provided. Since the medium whose temperature is adjusted through the radiator flows into the heat exchanger 40, the temperature of the power storage module 2 is effectively adjusted by the heat exchanger 40.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  The present invention is suitable as a power storage device mounted on a vehicle, but can also be applied to a power storage device used other than the vehicle.

1,100 power storage device
DESCRIPTION OF SYMBOLS 2 Power storage module 3 Power storage cell 5 Power storage body 6 Cell case 9 Electrode tab 10 Cell frame body 20 Heat transfer body 21 Heat absorption part 21A Electrode tab heat absorption part 22 Heat radiation part 30 Radiator 40 Heat exchanger

Claims (6)

A power storage device for charging and discharging a power storage cell,
The storage cell is
A power storage unit for storing electric charge;
A cell case containing the power storage unit;
An electrode tab for guiding current to the electricity storage body,
A cell frame coupled to the cell case;
A heat transfer body provided between the cell case and the cell frame, for transferring heat of the storage cell to the outside of the cell case;
A power storage device comprising: The power storage device according to claim 1,
The heat transfer body is
An endothermic part in contact with the cell case;
And a heat radiating part facing the outside of the cell case. The power storage device according to claim 2,
The heat absorption part has an electrode tab heat absorption part facing the electrode tab through the cell case. The power storage device according to any one of claims 1 to 3,
The power storage device, wherein the heat transfer body is formed along a surface of the cell frame. A power storage device comprising a power storage module in which the power storage cells according to any one of claims 1 to 4 are stacked,
A power storage device comprising a radiator that releases heat of the heat transfer body to outside air. A power storage device comprising a power storage module in which the power storage cells according to any one of claims 1 to 4 are stacked,
A power storage device comprising a heat exchanger that circulates a medium that exchanges heat with the heat transfer body.

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